PYQ Vault
EbooksTutor

Day 335: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Chemical Kinetics. Asked once: 2021 Paper 21 (same type asked 5 times) See all 5 of this type

    51
    The first order rate constant for the decomposition of CaCO3CaCO_{3} at 700 K700\text{ }K is 6.36×10−3 s−16.36 \times10^{- 3}{\text{ }s}^{- 1} and activation energy is 209 kJ mol−1209\text{ }kJ{\text{ }mol}^{- 1}. Its rate constant (in s −1\ ^{- 1} ) at 600 K600\text{ }K is x×10−6x \times10^{- 6}. The value of xx is (Nearest integer) [Given R=8.31 J K−1 mol−1;log⁡6.36×10−3=−2.19R = 8.31\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1};\log6.36 \times10^{- 3}= - 2.19, 10−4.79=1.62×10−510^{- 4.79}= 1.62 \times10^{- 5} ]

  2. Question 2

    Solutions. Asked once: 2021 Paper 13 (same type asked 5 times) See all 5 of this type

    31
    Which of the following 0.06M0.06M solution has the lowest freezing point?

    Tap an option to check your answer.

  3. Question 3

    The p-Block Elements. Asked once: 2021 Paper 1 (same type asked 5 times) See all 5 of this type

    48
    Given below are two statements: Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame. In the light of the above statements, choose the most appropriate answer from the options given below.

    Tap an option to check your answer.

  4. Question 4

    Chemical Kinetics. Asked once: 28 Jun 2022 (same type asked 5 times) See all 5 of this type

    145
    A radioactive element has a half- life of 200 days. The percentage of original activity remaining after 83 days is (Nearest integer) (Given: antilog 0.125=1.3330.125 = 1.333, antilog 0.693=0.693 = 4.93)

  5. Question 5

    Chemical Kinetics. Asked once: 2021 Paper 20 (same type asked 5 times) See all 5 of this type

    52
    The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is 2 K2Cr2O7+8H2SO4+3C2H6O→2Cr2(SO4)3+2{\text{ }K}_{2}Cr_{2}O_{7}+ 8H_{2}SO_{4}+ 3C_{2}H_{6}O \rightarrow 2Cr_{2}\left( SO_{4} \right)_{3}+ 3C2H4O2+2 K2SO4+11H2O3C_{2}H_{4}O_{2}+ 2{\text{ }K}_{2}SO_{4}+ 11H_{2}O If the rate of appearance of Cr2(SO4)3Cr_{2}\left( SO_{4} \right)_{3} is 2.67 mol2.67\text{ }mol min⁡−1\min^{- 1} at a particular time, the rate of disappearance of C2H6OC_{2}H_{6}O at the same time is ____\_\_\_\_ mol min⁡−1\min^{- 1}. (Nearest integer)